Motion blur issue with custom prim adapter going from usd 22 to 24 and renderman from 25 to 26

Hi,
for our custom primitive adapter we were using “samplePrimvar” to provide data for motion blur.
From what it looks the behaviour has changed and now the “samplePrimvar” is not being called.
Do you know if there is a different function that we should override now or other clues on how to get motion blur back?

Also in my investigation I’ve found that “SampleTransform” is being used to do motion blur for basis curves point positions.

Kind regards,
Aleks